Assessment of Accelerometers for Measuring Upper-Extremity Physical Activity

Area of Science:

• Biomechanics
• Rehabilitation Engineering
• Wearable Technology

Background:

• Monitoring upper-extremity (UE) motion is crucial for assessing rehabilitation progress and daily activity.
• Traditional methods rely on subjective visual observation, which can be inconsistent.
• Objective measures are needed to accurately quantify UE movements.

Purpose of the Study:

• To evaluate the efficacy of triaxial accelerometers in measuring upper-extremity motions.
• To establish the correlation between accelerometer data and visually observed arm movements.
• To determine the potential of accelerometers for monitoring exercise compliance.

Main Methods:

• A cross-sectional study involving 30 healthy participants.
• Participants wore accelerometers on each wrist while performing activities of daily living (ADLs) and rehabilitation exercises.
• Arm motions were simultaneously recorded by accelerometers and visually observed by a researcher.

Main Results:

• A strong positive correlation (r = .93) was found between accelerometer counts and visual counts for ADLs.
• Accelerometers detected significant side-to-side differences in arm movements during ADLs and most rehabilitation exercises.
• The devices could differentiate between various arm movement velocities, crucial for rehabilitation assessment.

Conclusions:

• Triaxial accelerometers provide a reliable method for quantifying upper-extremity activity.
• Accelerometer data shows a linear relationship with visually observed arm motions.
• This technology holds potential for objectively monitoring arm usage and exercise compliance during rehabilitation.